| 摘要 |
PROBLEM TO BE SOLVED: To enhance heat resistance of resin varnish by making the vanish contain a cyanate ester compound, a monovalent phenol compound, dicyclopentadiene resin, a flame retardant, a metal based reaction catalyst, an aromatic hydrocarbon based solvent and a ketone based solvent as inevitable components. SOLUTION: The modified cyanate ester resin varnish for printed wiring board contains, as inevitable components, a cyanate ester compound shown by formula I, a monovalent phenol compound shown by formula III dicyclopentadiene resin, a flame retardant exhibiting no reactivity to cyanate ester compound, a metal based reaction catalyst, an aromatic hydrocarbon based solvent arid a ketone based solvent. In the formula I, R1 is shown by formula II, R2 and R3 represent a hydrogen or methyl group. In formula III, R4 and R5 represent a hydrogen atom or a lower alkyl group of 1-4C and n represents a positive integer of 1-2.
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